Strong's Exhaustive Concordance is commonly regarded as the world's most comprehensive, understandable and easy-to-use concordance for studying the original language and languages used in the Bible. It can be used with either the King James Version of the Bible or the New American Standard Bible, and it includes information on both Hebrew and Greek terms used in these versions.
A concordance is an alphabetical list of words used in a text, along with a listing of all instances of that word in the text. Taking the King James Version, or KJV, of the Bible as an example, Strong's Concordance assigns every word in the KJV a number, and each word is then referenced with its corresponding word in Hebrew or Greek. Users can then look in a Greek or Hebrew dictionary to learn more about the specific terms used in the creation of the KJV verse.
Strong's Concordance lists 8,674 unique Hebrew words and 5,624 Greek words. Each word's number is referred to colloquially as its Strong number. For example, if one searches for Hebrew Strong number 342, the word "ebah" is returned, along with a notation that the word, a feminine noun that means "enmity," is used five times in the Old Testament.